LLC643F26M - LLC6 Series

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Littelfuse Liquid Level Controllers
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The LLC6 Series is a plug-in, single-probe conductive liquid level control designed for low liquid level cutoff protection. It offers a factory fixed time delay of 1 - 60s and is available in input voltages of 24, 120, or 230VAC. LED indicator illuminates whenever the LLC6’s 10A, SPDT output relay is energized. Available with automatic/manual reset or a special manual reset with power outage feature, which auto resets the unit when power is restored and the water level is acceptable. 24VAC and 120VAC units are recognized as limit switches under UL353 (230VAC units are UL508) and CSA certified under Standard 14.


See datasheet for operation and reset details.

Property (Mouseover for details) Value
Input Voltage (V) 120VAC
Input Tolerance (%) -0.3
Input AC Line Frequency (Hz) 50/60Hz
Output Type Electromechanical relay
Output Form Non-isolated SPDT
Output Load Rating (VA) 10A resistive @ 240VAC; 1/4hp @ 125VAC; 1/2hp @ 250VAC
Time Delay Range 3s fixed
Time Delay Tolerance (%) ±20%
Reset Time (ms) Manual / automatic reset
Repeat Accuracy (%) ±10%
Sense Voltage 12VAC nominal at probe terminals
Sense Resistance (Ohms) 26 kΩ
Sense Resistance Tolerance Fixed ±10%
Control Type ON/OFF (single level) resistance sensor with built-in time delay to prevent rapid cycling
Isolation Voltage (V) ≥2500V RMS between input and output terminals
Surge Protection IEEE C62.41-1991 Level A
Termination Type 11-pin relay type
Mounting Method Plug-in socket
Operating Temperature -40° to 60°C (-40°F to 140°F)
Storage Temperature (F/C) -40° to 80°C (-40°F to 176°F)
Humidity 95% relative non-condensing
Dimensions 2.91 x 2.39 x 1.78 in. (73.9 x 60.7 x 45.2mm)
Weight (lbs/g) ≅7.3oz (207g)